What is the evap solenoid valve? What is the role of the evap solenoid valve?

What is the evap solenoid valve

evap solenoid valve is a carbon canister solenoid valve. The carbon canister solenoid valve is installed on a car or motorcycle to reduce emissions caused by fuel evaporation. A device that reduces air pollution while increasing fuel efficiency.

evap solenoid valveIt is controlled by the fuel tank and activated carbon canisterSolenoid valve, which can control fuel evaporation using the engine control module. The EVAP system can store the fuel vapor (HC) generated by the fuel system to prevent the fuel vapor from leaking into the atmosphere. At the same time, the collected fuel vapor can be sent to the intake manifold in a timely manner, mixed with the normal mixture and then entered into the engine for combustion, so that the fuel can be Make full use of today's EVAP system that basically uses engine control modules.

Function of evap solenoid valve

evap solenoid valveSend the HC gasoline molecules in the carbon canister into the engine to participate in combustion at the appropriate time. It is used to reduce the environmental pollution caused by HC molecules being discharged directly into the atmosphere. It is well known that automobile exhaust pollutes the air environment extremely seriously. However, the air pollution caused by gasoline molecules being emitted directly into the atmosphere without burning is not taken seriously.

However, in the European No. 3 emission standards, the comprehensive pollution of cars in a relatively sealed environment is monitored. At this time, the pollution of the atmosphere by gasoline vapor in the fuel tank is also measured. monitor. In response to this situation, the car has also made corresponding changes. The Prime Minister canceled the pressure vent valve on the fuel tank cap, installed a pipeline on the fuel tank, and set up a pressure valve at the connection between the pipeline and the fuel tank. One end is connected to the carbon canister. (The inside of the carbon canister is composed of activated carbon that can strongly adsorb HC molecules and an external sealed container.) When the HC molecules in the fuel tank volatilize, the pressure in the fuel tank increases and opens the pressure vent valve, entering the carbon canister through the pipeline. However, the capacity of the carbon canister is limited, and if HC steam molecules participate in the work of the engine, it can also achieve the purpose of reducing pollution and saving energy.

Therefore, another pipeline is installed in the carbon canister to connect to the engine, so that the HC molecules introduced in the carbon canister can be introduced into the engine to participate in the engine's work under certain specific working conditions. But when and how many HC molecules are introduced are controlled by PCM. Therefore, an EVAP canister solenoid valve is installed at the part where the carbon canister is connected to the engine, which is used by the PCM to control the introduction of the appropriate number of HC molecules at the appropriate time. EVAP is actually a switch controlled by the PCM. When the power is turned on, the electronic valve opens, and the vacuum suction of the intake manifold draws HC molecules into the intake passage to participate in the combustion of the engine. Reduce HC pollution directly discharged into the atmosphere.

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